/*
 * Created on 02.10.2003
 * 
 * To change the template for this generated file go to
 * Window&gt;Preferences&gt;Java&gt;Code Generation&gt;Code and Comments
 */
package com.googlecode.veloeclipse.preferences;

import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.preference.PreferenceStore;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;

/**
 * DOCUMENT ME!
 * 
 * @version $Revision: 7 $
 * @author <a href="mailto:akmal.sarhan@gmail.com">Akmal Sarhan </a>
 */
public class VelocityOverlayPreferenceStore implements IPreferenceStore
{

    public static final TypeDescriptor BOOLEAN = new TypeDescriptor();
    public static final TypeDescriptor DOUBLE  = new TypeDescriptor();
    public static final TypeDescriptor FLOAT   = new TypeDescriptor();
    public static final TypeDescriptor INT     = new TypeDescriptor();
    public static final TypeDescriptor LONG    = new TypeDescriptor();
    public static final TypeDescriptor STRING  = new TypeDescriptor();
    private IPreferenceStore           fParent;
    private IPreferenceStore           fStore;
    private OverlayKey[]               fOverlayKeys;
    private PropertyListener           fPropertyListener;

    public VelocityOverlayPreferenceStore(IPreferenceStore parent, OverlayKey[] overlayKeys)
    {
        fParent = parent;
        fOverlayKeys = overlayKeys;
        fStore = new PreferenceStore();
    }

    private OverlayKey findOverlayKey(String key)
    {
        for (int i = 0; i < fOverlayKeys.length; i++)
        {
            if (fOverlayKeys[i].fKey.equals(key)) { return fOverlayKeys[i]; }
        }
        return null;
    }

    private boolean covers(String key)
    {
        return (findOverlayKey(key) != null);
    }

    private void propagateProperty(IPreferenceStore orgin, OverlayKey key, IPreferenceStore target)
    {
        if (orgin.isDefault(key.fKey))
        {
            if (!target.isDefault(key.fKey))
            {
                target.setToDefault(key.fKey);
            }
            return;
        }
        TypeDescriptor d = key.fDescriptor;
        if (BOOLEAN == d)
        {
            boolean originValue = orgin.getBoolean(key.fKey);
            boolean targetValue = target.getBoolean(key.fKey);
            if (targetValue != originValue)
            {
                target.setValue(key.fKey, originValue);
            }
        } else if (DOUBLE == d)
        {
            double originValue = orgin.getDouble(key.fKey);
            double targetValue = target.getDouble(key.fKey);
            if (targetValue != originValue)
            {
                target.setValue(key.fKey, originValue);
            }
        } else if (FLOAT == d)
        {
            float originValue = orgin.getFloat(key.fKey);
            float targetValue = target.getFloat(key.fKey);
            if (targetValue != originValue)
            {
                target.setValue(key.fKey, originValue);
            }
        } else if (INT == d)
        {
            int originValue = orgin.getInt(key.fKey);
            int targetValue = target.getInt(key.fKey);
            if (targetValue != originValue)
            {
                target.setValue(key.fKey, originValue);
            }
        } else if (LONG == d)
        {
            long originValue = orgin.getLong(key.fKey);
            long targetValue = target.getLong(key.fKey);
            if (targetValue != originValue)
            {
                target.setValue(key.fKey, originValue);
            }
        } else if (STRING == d)
        {
            String originValue = orgin.getString(key.fKey);
            String targetValue = target.getString(key.fKey);
            if ((targetValue != null) && (originValue != null) && !targetValue.equals(originValue))
            {
                target.setValue(key.fKey, originValue);
            }
        }
    }

    /**
     * DOCUMENT ME!
     */
    public void propagate()
    {
        for (int i = 0; i < fOverlayKeys.length; i++)
        {
            propagateProperty(fStore, fOverlayKeys[i], fParent);
        }
    }

    private void loadProperty(IPreferenceStore orgin, OverlayKey key, IPreferenceStore target, boolean forceInitialization)
    {
        TypeDescriptor d = key.fDescriptor;
        if (BOOLEAN == d)
        {
            if (forceInitialization)
            {
                target.setValue(key.fKey, true);
            }
            target.setValue(key.fKey, orgin.getBoolean(key.fKey));
            target.setDefault(key.fKey, orgin.getDefaultBoolean(key.fKey));
        } else if (DOUBLE == d)
        {
            if (forceInitialization)
            {
                target.setValue(key.fKey, 1.0D);
            }
            target.setValue(key.fKey, orgin.getDouble(key.fKey));
            target.setDefault(key.fKey, orgin.getDefaultDouble(key.fKey));
        } else if (FLOAT == d)
        {
            if (forceInitialization)
            {
                target.setValue(key.fKey, 1.0F);
            }
            target.setValue(key.fKey, orgin.getFloat(key.fKey));
            target.setDefault(key.fKey, orgin.getDefaultFloat(key.fKey));
        } else if (INT == d)
        {
            if (forceInitialization)
            {
                target.setValue(key.fKey, 1);
            }
            target.setValue(key.fKey, orgin.getInt(key.fKey));
            target.setDefault(key.fKey, orgin.getDefaultInt(key.fKey));
        } else if (LONG == d)
        {
            if (forceInitialization)
            {
                target.setValue(key.fKey, 1L);
            }
            target.setValue(key.fKey, orgin.getLong(key.fKey));
            target.setDefault(key.fKey, orgin.getDefaultLong(key.fKey));
        } else if (STRING == d)
        {
            if (forceInitialization)
            {
                target.setValue(key.fKey, "1"); //$NON-NLS-1$
            }
            target.setValue(key.fKey, orgin.getString(key.fKey));
            target.setDefault(key.fKey, orgin.getDefaultString(key.fKey));
        }
    }

    /**
     * DOCUMENT ME!
     */
    public void load()
    {
        for (int i = 0; i < fOverlayKeys.length; i++)
        {
            loadProperty(fParent, fOverlayKeys[i], fStore, true);
        }
    }

    /**
     * DOCUMENT ME!
     */
    public void loadDefaults()
    {
        for (int i = 0; i < fOverlayKeys.length; i++)
        {
            setToDefault(fOverlayKeys[i].fKey);
        }
    }

    /**
     * DOCUMENT ME!
     */
    public void start()
    {
        if (fPropertyListener == null)
        {
            fPropertyListener = new PropertyListener();
            fParent.addPropertyChangeListener(fPropertyListener);
        }
    }

    /**
     * DOCUMENT ME!
     */
    public void stop()
    {
        if (fPropertyListener != null)
        {
            fParent.removePropertyChangeListener(fPropertyListener);
            fPropertyListener = null;
        }
    }

    /*
     * @see IPreferenceStore#addPropertyChangeListener(IPropertyChangeListener)
     */
    public void addPropertyChangeListener(IPropertyChangeListener listener)
    {
        fStore.addPropertyChangeListener(listener);
    }

    /*
     * @see IPreferenceStore#removePropertyChangeListener(IPropertyChangeListener)
     */
    public void removePropertyChangeListener(IPropertyChangeListener listener)
    {
        fStore.removePropertyChangeListener(listener);
    }

    /*
     * @see IPreferenceStore#firePropertyChangeEvent(String, Object, Object)
     */
    public void firePropertyChangeEvent(String name, Object oldValue, Object newValue)
    {
        fStore.firePropertyChangeEvent(name, oldValue, newValue);
    }

    /*
     * @see IPreferenceStore#contains(String)
     */
    public boolean contains(String name)
    {
        return fStore.contains(name);
    }

    /*
     * @see IPreferenceStore#getBoolean(String)
     */
    public boolean getBoolean(String name)
    {
        return fStore.getBoolean(name);
    }

    /*
     * @see IPreferenceStore#getDefaultBoolean(String)
     */
    public boolean getDefaultBoolean(String name)
    {
        return fStore.getDefaultBoolean(name);
    }

    /*
     * @see IPreferenceStore#getDefaultDouble(String)
     */
    public double getDefaultDouble(String name)
    {
        return fStore.getDefaultDouble(name);
    }

    /*
     * @see IPreferenceStore#getDefaultFloat(String)
     */
    public float getDefaultFloat(String name)
    {
        return fStore.getDefaultFloat(name);
    }

    /*
     * @see IPreferenceStore#getDefaultInt(String)
     */
    public int getDefaultInt(String name)
    {
        return fStore.getDefaultInt(name);
    }

    /*
     * @see IPreferenceStore#getDefaultLong(String)
     */
    public long getDefaultLong(String name)
    {
        return fStore.getDefaultLong(name);
    }

    /*
     * @see IPreferenceStore#getDefaultString(String)
     */
    public String getDefaultString(String name)
    {
        return fStore.getDefaultString(name);
    }

    /*
     * @see IPreferenceStore#getDouble(String)
     */
    public double getDouble(String name)
    {
        return fStore.getDouble(name);
    }

    /*
     * @see IPreferenceStore#getFloat(String)
     */
    public float getFloat(String name)
    {
        return fStore.getFloat(name);
    }

    /*
     * @see IPreferenceStore#getInt(String)
     */
    public int getInt(String name)
    {
        return fStore.getInt(name);
    }

    /*
     * @see IPreferenceStore#getLong(String)
     */
    public long getLong(String name)
    {
        return fStore.getLong(name);
    }

    /*
     * @see IPreferenceStore#getString(String)
     */
    public String getString(String name)
    {
        return fStore.getString(name);
    }

    /*
     * @see IPreferenceStore#isDefault(String)
     */
    public boolean isDefault(String name)
    {
        return fStore.isDefault(name);
    }

    /*
     * @see IPreferenceStore#needsSaving()
     */
    public boolean needsSaving()
    {
        return fStore.needsSaving();
    }

    /*
     * @see IPreferenceStore#putValue(String, String)
     */
    public void putValue(String name, String value)
    {
        if (covers(name))
        {
            fStore.putValue(name, value);
        }
    }

    /*
     * @see IPreferenceStore#setDefault(String, double)
     */
    public void setDefault(String name, double value)
    {
        if (covers(name))
        {
            fStore.setDefault(name, value);
        }
    }

    /*
     * @see IPreferenceStore#setDefault(String, float)
     */
    public void setDefault(String name, float value)
    {
        if (covers(name))
        {
            fStore.setDefault(name, value);
        }
    }

    /*
     * @see IPreferenceStore#setDefault(String, int)
     */
    public void setDefault(String name, int value)
    {
        if (covers(name))
        {
            fStore.setDefault(name, value);
        }
    }

    /*
     * @see IPreferenceStore#setDefault(String, long)
     */
    public void setDefault(String name, long value)
    {
        if (covers(name))
        {
            fStore.setDefault(name, value);
        }
    }

    /*
     * @see IPreferenceStore#setDefault(String, String)
     */
    public void setDefault(String name, String value)
    {
        if (covers(name))
        {
            fStore.setDefault(name, value);
        }
    }

    /*
     * @see IPreferenceStore#setDefault(String, boolean)
     */
    public void setDefault(String name, boolean value)
    {
        if (covers(name))
        {
            fStore.setDefault(name, value);
        }
    }

    /*
     * @see IPreferenceStore#setToDefault(String)
     */
    public void setToDefault(String name)
    {
        fStore.setToDefault(name);
    }

    /*
     * @see IPreferenceStore#setValue(String, double)
     */
    public void setValue(String name, double value)
    {
        if (covers(name))
        {
            fStore.setValue(name, value);
        }
    }

    /*
     * @see IPreferenceStore#setValue(String, float)
     */
    public void setValue(String name, float value)
    {
        if (covers(name))
        {
            fStore.setValue(name, value);
        }
    }

    /*
     * @see IPreferenceStore#setValue(String, int)
     */
    public void setValue(String name, int value)
    {
        if (covers(name))
        {
            fStore.setValue(name, value);
        }
    }

    /*
     * @see IPreferenceStore#setValue(String, long)
     */
    public void setValue(String name, long value)
    {
        if (covers(name))
        {
            fStore.setValue(name, value);
        }
    }

    /*
     * @see IPreferenceStore#setValue(String, String)
     */
    public void setValue(String name, String value)
    {
        if (covers(name))
        {
            fStore.setValue(name, value);
        }
    }

    /*
     * @see IPreferenceStore#setValue(String, boolean)
     */
    public void setValue(String name, boolean value)
    {
        if (covers(name))
        {
            fStore.setValue(name, value);
        }
    }

    public static final class TypeDescriptor
    {

        private TypeDescriptor()
        {
        }
    }

    public static class OverlayKey
    {

        TypeDescriptor fDescriptor;
        String         fKey;

        public OverlayKey(TypeDescriptor descriptor, String key)
        {
            fDescriptor = descriptor;
            fKey = key;
        }
    }

    private class PropertyListener implements IPropertyChangeListener
    {

        /*
         * @see IPropertyChangeListener#propertyChange(PropertyChangeEvent)
         */
        public void propertyChange(PropertyChangeEvent event)
        {
            OverlayKey key = findOverlayKey(event.getProperty());
            if (key != null)
            {
                propagateProperty(fParent, key, fStore);
            }
        }
    }
}
